1. Gastroenterology Department, Hospital Interzonal General de Agudos San Martín de La Plata, La Plata, Argentina
2. Pathology Department, Hospital Interzonal General de Agudos San Martín de La Plata, La Plata, Argentina
3. Surgery Department, Hospital Interzonal General de Agudos San Martín de La Plata, La Plata, Argentina